Dynamo-electric machine with compensating windings.



No. 877,017. PATENTED JAN/21, 1908.

v L. TORDA. DYNAMO ELECT-RIG MACHINE WITH GOMPENSATING WINDINGS.

APPLICATION FILED MAILB, 1907.

- W/T/VESSES m m m/z %m% M 7M LUDWIG TORDA OF cnrswreir, ENGLAND.

DYNAMO-EI JECTRIQ MACHINE WITH GQKPENBATING WINDINGS.

Specification of Letters Patent.

Patented Jan. 21, 1908.

Application an March 8.1907. Serialrl'fo. 361.316.

To-izll'wkom itma/y cn'ncern:

Be it known that .I, LUDWIG TORDA, a subject of the .Emperor of Austriarllungary,

and residin at Chiswick, in the county of This invention relates to dynamo electric machines, and especially to continuous current machines, of the. compensated type.

A continuous current compensated machine is-characterized by a winding placed on the field'magnet system, around and close to the armature, and is adapted to neutralize more orless the field distorting effect of the armature and at the same time assisting to obtain a good commutation. -Compensated machines hitherto constructed have in their best forms a field magnet system, which is.

' built up of laminated iron pressed together and supported by a cast iron frame. The lamination on its periphery is provided with slots in which the compensating winding is embedded in a similar we to the winding of a slotted armature. This method of construction of the compensated machines is somewhat expensive and the object of my invention is to simplify and cheapen their construction. To attain this purpose I employ iron masses or masses of other paramagnetic material as a part of the compensating winding (which in this case may more appropriately be called by the general term: compensating device which part of the compensating device serves at the same time to carry the main magnetic lines, or in other words, the iron or the like is also a part of the main magnetic circuit, and I suitably connect the iron or other masses by a good condgficting material to obtain the compensating e ect.

The invention is fully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts of my improvements are designated by suitable reference characters in each of the views, and in which:

. Figure 1 is an end elevation of a portion of a multipolar dynamo, showing the essential part of the magnetic circuit, and of the compensating device. 2 is a sectional side view of the same. ig. 3 represents diainsulating material 0,.

' insulating material'c grammatically and develo ed in a'plan apertion of the compensatingdiavice.

In the above figures wrepresents iron bars which are connected together -by strips 1) of copper or aluminium or the like in a suitable way, as shown in Fig. 3, to obtain a compensatlng effect. The bars a areinsulated from each other and from the yoke e by sheets of These bars are fixed to the yoke by bolts g tapped into the bars and nuts h, which on their art are also insulated from the yoke by tu es and sheets of he nuts 7:. are shown arranged in recesses provided in the yoke and which :recesses are covered b sheets i, of

metal or other suitable materia d designates the field coils which are to be i kept in position in the usual way; f indicates the armature, of-which no details are shown,

as same is of the usual and well known construction.

The arrows in Fig. 3 indicate-the direction of flow of the electric current in the bars a, assfiiming that the current is flowing from A to The constructionand arrangement of the compensating device and of the field magnet system shown and described is only one of many different ways in which the invention may be carried into practical effect, and various modifications may be made without departing from the spirit of the invention or sacrificing its advantages.

The main field winding is laced in any suitable way on the frame. If preferred, in addition to the compensating device so called auxliary or commutating magnets can be use It will be readily understood that this invention is applicable to two pole as well as to multi olar machines.

The a vantages obtained by my invention are as follows :1. Reduction in copper of the compensatin winding. 2. Discarding of a slotted fiel magnet system. 3. The

rnagnet frame can be built of chea solid 110I1 serving as actlve material, in p ace or laminated iron, which is expensive and must be supported by a cast ironframe, which does not serve as an active material. 4. Reduction in cost of labor as the manufacture is simplified. 5. Uniform distribution of the compensating ampere conductors along the ole arc.

T e so called inter-pole machines, '5. e.

machines fitted with auxiliary or commutatmagnets can also be considered as comated machines, as in the same the auxiliwinding, though not adapted to neutral.- ize the field distortion, is essentially a compensating winding concentrated in the neutral zone between every two adjacent main poles, in order to improve commutation. As compared with inter-pole machines, my invention offers the following advantages 1. Reduction in copper for the main .field windin 2. Reductlon of the radial dimensions o the machines as the polar projections become much shorter. 3. Reduction in iron for the magnet frame. 4. Increase of the overall efficiency of the machines, as the constant losses, viz: the excitation and the iron losses 'are reduced. 5. Sparkless commutation obtainable within much wider limits.

Having fully described my invention, what I claim' as new, and desire to secure by Letters Patent, is:-

1. In a d amo electric machine of the com ensate type, a compensating device, in w 'chthe compensating elements serve to carry the compensating current and also the main ma etic lines.

2. In ynamo electric machines, a compensating device for neutralizing the field distorting effect of the armature and assisting the commutation, consisting of bars of iron or other paramagnetic material forming part of the main magnetic circuit, and conductors so connecting the bars that the desired compensating eiiect is obtained.

3. In a dynamo-electric machine a plurality of polar projections constructed wholly or part y of magnetic material electrically insulated from each'other, and from the frame, and copper or other good conductors connecting the said bars suitably to obtain a compensating efiect.

4. In a dynamo-electric machine a plurality of or lpart y of magnetic material, a plurality of bo t and nuts to fix the said bars to the .frame the said bolts and nuts eing suitably insulated from theframe. J]

olar projections, constructed wholly 5. In a dynamo-electric machinea pluralof polar projections partly or wholly of aramagnetic bars, bolts and nuts to fix sai bars to the frame, recesses for said nuts and sheets of metal or other material to cover the said recesses.

In testimony that I claim the foregoing as my invention I have signed my name in presence of the subscribing witnesses this 25th day of February, 1907.

LUDWIG TORDA.

Witnesses? H. D. JAMESON,

F. L. RAND. 

